Benchmark comparing `util._extend()`, `Object.assign()`,
and the spread operator for object assignment.
`util._extend()` still wins currently.
PR-URL: https://github.com/nodejs/node/pull/18442
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
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